Question

I need help with this vector and dot product question. I want to make sure my answer is right.

Answer 1

So here's the work I did.
\[-4(3,5)--2(4, -4)\]
\[(-12, -20)-(-8, 8)\]
Then I subtracted those numbers
\[96-(-160)\]
I got 256 as an answer but that's not an option

Answer 2

Hey I did it wrong, the answer is -112, -84.

Answer 3

WAIT that's from a different question. I still need help